Is this sentence more common/proper than to say "Er bordet renere end det var i går?"?
"Is the table cleaner than yesterday?" as opposed to "Is the table cleaner than it was yesterday?" They're saying the same thing, just in two slightly different ways.
Okay. I know, but every language is slightly different. I didn't just want to assume that what was true for English was also true for Danish.
Nice to know that errors of comparison are common in Danish as well.